Mutant G-protein coupled receptors and methods for selecting them
The invention relates to mutant G-protein coupled receptors with increased conformational stability, and methods of use thereof. In some aspects, polynucleotides encoding the mutant G-protein coupled receptors are provided. In some aspects, host cells comprising the polynucleotides are provided. In some aspects, the invention relates to crystallized forms of the mutant G-protein coupled receptors, and methods of preparing the same.
1. A mutant GPCR wherein (i) the mutant GPCR is a mutant β-adrenergic receptor which, when compared to the corresponding wild-type adrenergic receptor, has increased conformational thermostability and has at least one amino acid replacement at a position which corresponds to any of the following positions according to the turkey β-adrenergic receptor defined as SEQ ID NO: 1: G67A, G98A, V230A, D322A, Y227A, A234L, A282L, A334L, R68S, M90V, F338M, I129V, V230A, or F327A; or
wherein (ii) the mutant GPCR is a mutant adenosine receptor which, when compared to the corresponding wild-type adenosine receptor, has increased conformational stability and has at least one amino acid replacement at a position which corresponds to any of the following positions according to the human adenosine A2a receptor defined as SEQ ID NO: 5: G114A, G118A, L167A, A184L, R199A, A203L, L208A, Q210A, S213A, E219A, R220A, S223A, T224A, Q226A, K227A, H230A, L241A, P260A, S263A, L267A, L272A, T279A, N284A, Q311A, P313A, or K315A; or
wherein (iii) the mutant GPCR is a mutant neurotensin receptor which, when compared to the corresponding wild-type neurotensin receptor, has increased conformational thermostability and has at least one amino acid replacement at a position which corresponds to any of the following positions according to the rat neurotensin receptor defined as SEQ ID NO: 9: A69L, A73L, A86L, A90L, H103A, V165A, E166A, G215A, V229A, M250A, I253A, A177L, R183A, I260A, T279A, T294A, G306A, L308A, V309A, L310A, V313A, F342A, F358A, V360A, S362A, N370A, S373A, F380A, A385L, P389A, G390A, or R395A.
2. A mutant GPCR according to claim 1 , which is in a solubilized form.
3. A mutant GPCR according to claim 1 , which is immobilized to a solid support.